I think a lot of it depends on the relationship you have with the parents. I was often in situations where I could not leave DD2 with someone else and at 5yo, there was no way I would leave DD1 ata HJ party (home party yes, but not a public venue). Some parents knew and understood, even saying with the invite that DD2 was welcome, or if approached were fine with her coming along. Maybe it was due to many of DD's friends also having younger sibling
In return I tend to be ok with younger siblings as I understand it is not always practical. Now DD1 is older and can be left easily, it is no longer an issue, but at DD2 seems to be friends with DD1's friends siblings, she often gets her own invite.
At age 5, I leave DS at parties at sports centres, farms etc. It is expected - the parents are very much "hi, hi Liebling, you can pick him up at X time". If he's clingly then I'm told I can stay if I really want - code for I'm not really wanted.
I would not expect siblings to turn up to a party where I pay for places - unless the mother took them off and they didn't join in the party.
When I have done a party at home, siblings are welcome. Because I invited only a few and Liebling knew the siblings. I think now he's at school I don't know if there would be room for siblings, and the only home party he has attended since we moved I was expected to leave him there too.
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